Add 2020/yang/try.sh + format/typo checks

The Makefile also has been updated with a new rule to compile the C++
code the author provided which can preprocess the output of the program
to make it more acceptable to some compilers.

Format/typo check README.md file.

This should complete 2020! There might be another change in another year
but besides that and the YYYY/README.md files the review of all entries
can be mostly considered done (mostly because I will probably do a very
quick pass but this pass is not important one way or another).

2020/yang/Makefile

@@ -133,6 +133,10 @@ all: data ${TARGET}
 ${PROG}: ${PROG}.c
 	${CC} ${CFLAGS} $< -o $@ ${LDFLAGS}
 
+cppp: cppp.cc
+	${C_PLUSPLUS} -std=c++11 $< -o $@ ${LDFLAGS}
+
+
 # alternative executable
 #
 alt: data ${ALT_TARGET}